Dressing device for grinding wheels



April 1, 1952 M. HRANKQWSKI DRESSING DEVICE FOR GRINDING WHEELS FiledJuly 14, 1948 2 SHEETS-SI-1EET l JNVENTOR.

L m M. M

HRANKOWSKI M. H RAN KOWSKI DRESSING DEVICE FOR GRINDING WHEELS April 1,1952 Filed July 14, 1948 2 SHEETS-SHEET 2 Patented Apr. 1 1952 UNITEDSTATES PATENT OFFICE DRESSING DEVICE FOR GRINDING WHEELS MichaelHrankowski, Plainfield, N. J.

Application July 14, 1948, Serial No. 38,610

1 Claim. 1

This invention relates to new and useful improvements in devices fordressing grinding wheels.

The cardinal object of the invention is to provide an improved suchdevice, for dressing or truing the grinding face of a grinding wheel,and which is characterized by marked compactness throughout, yetnevertheless with exceptionally rugged parts, and these last strikinglyfew in number.

Another object is to provide a device as above, and with only a very fewof its few parts relatively movable in using the device, and, further,with these parts so assembled and related that by their very arrangementand special shapings not only are all the parts kept few in number butthey are exceedingly easy and inexpensive to fabricate and assemble,and, besides, the advantage is present that should dust and grit beaccumulated to an extent possible to become an agent to disturb easy andexpeditious manual operation of the device such an accumulation isreadily removed without take-down of the assembly.

The above and other objects, and the various other novel features andadvantages of the device will be pointed out or become apparenthereinafter.

For further comprehension of the invention, and of the objects andadvantages thereof, reference will be had to the following descriptionand accompanying drawings, and to the appended claim in which thevarious novel features of the invention are more particularly set forth.

In the accompanying drawings forming a material part of this disclosure:

Fig. 1 is a perspective view of a familiar bench and floor type ofgrinding machine, including the conventional flat guide plate on whichthe new device may, for instance, be expeditiously and eflicientlytemporarily mounted for using the device to quickly dress the grindingwheel of said machine.

Fig. 2 is a top perspective view of the new device, detached from saidplate or other selected support.

Fig. 3 is a top plan view of said device, partially broken away andpartially in section.

Fig. 4 is an end elevation thereof, looking toward the right in Fig. 3.

Fig. 5 is a detail view, being a fragmentary vertical section on theline 5-5 of Fig. 3.

Fig. 6 is a perspective view of that part of the device which will belowbe called the barrel member, and showing also an integral auxiliarystructure incorporatmg a pair ofslides said member being viewed insubstantially the direction of the arrow 6 of Fig. 2.

The device for dressing grinding wheels, according to the presentinvention, includes a base plate I0 fiat all over its bottom and havinga main portion of elongate rectangular outline all around except at onecorner area where the said plate has a reduced extension H the rootsection l2 of which is curvilinearly extended away from said cornerarea.

Along the end of said main portion of the plate I 0 opposite to the endthereof from which said extension ll projects, and at the top of theplate, is an integral rib [4. At the inner side of this rib is a gib l5,undercut along its side remote from the rib. At the opposite end of themain portion of the plate I0 is another gib l6, this undercut along itsside facing the gib [5.

The gib I6 is fixed On top of the plate I0, as by riveting or in anyother suitable way, with the vertical Wall of its undercut portion andits vertical wall thereabove in parallelism with the inner side of therib I4.

The gib I5, having its side adjacent to the rib l4 and also both of itsvertical wall portions facing the gib 16 in parallelism with thevertical wall of the said undercut portion of the gib I6, is adjustabletoward and away from the gib l6, by means of a pair of set-screws H andI8 carried by the rib l4, and this adjustment is lockingly secured bymeans of a pair of screws "l9 and 20 downwardly entered in countersunkslots 2| and 22 through the gib l5, the lower ends of the shanks ofthese screws engaging drilled and tapped recesses in the top of theplate Ill.

The undercut portions of the gibs l5 and I6 constitute a fixed guidewaymeans relative to a pair of slides 23 and 24, each having a laterallyextended bottom flange 23 or 24*, for accommodation in said undercutportion of the adjacent gib I5 or [6. These slides 23 and 24 areintegral with a cylindrical pocket bearing sleeve or barrel 25; thisbarrel near opposite ends thereof overlying the slides 23 and 24 nearthe ends of the latter adjacent to the rear side 26 of the main plateI0. At said ends of the slides 23 and 24, and just beyond the rear sideof the barrel 25, the said slides are bridged by a bar-like connector 21integral with the slides (see Fig. 6) and also integral with thesomewhat flattened bottom 28 of the barrel (see Figs. 4 and 5).

The barrel 25 is bored from end to end and such bore is surface finishedto perfect cylindricity; and slidable in said bore is a cylindricalmember 29 also finished laterally thereof to per- One end of the member29 is cut away at top i and bottom to provide a reduced integral ear 32,

for pivotal connection, as at 33', with one end of a short link 34. Theother end of said link is pivotally connected, as at 35, to an end of alever 36 fulcrumed as at 31 to the outer end of the extension I! fromthe main plate H1. The ropposite end of said. lever carries a handle 38.7

By means of said handle, the member 29 may be shifted longitudinally toone limit of its movement relative to the barrel 25, and then to theother limit of its movement relative to said barrel. The amplitude ofthis reciprocatory movement of the member 29 is determined by the lengthof a slot 39 along the rear side of the barrel 25. This slot overliesthe bar-like connector 21, has rounded ends, and is about as long assaid connector. 7

Through said slot 39 there is projected th holder 49 for the grindingwheel dressing instrumentality.

Said holder is here shown as post-like and having at its outer end abifurcation as at 4| for rotatively mounting, on a shaft element 42integral with a set-screw 43, a group 44 of stone dressinginstrumentalities of a familiar kind incorporating a plurality ofalternatively arranged plane and toothed disks.

The inner end portion of the holder 40, where the latter projectsthrough the slot 39, is cylindrical, and this formation is continued asindicated at 45 to the inner end of said holder; this cylindricalportion-of the holder for being inserted into a matchingly shaped recess46 extended into the member 29 transversely thereof (see Fig. 5)

Said recess is about midway along the length of the member 29, and, nowagain referring to the already mentioned set-screw 3|, this is in adrilled and tapped hole vertically above the recess 45. Thus, with theaperture 39 through the top of the barrel 25 located at about midwayalong the length of said barrel, which aperture it will be noted isquite a bit larger than the head of said set-screw, the set-screw 3| ismade readily accessible by way of said aperture when the member 29 isarranged to bring the central portion of its length substantially midwaybetween the opposite ends of the barrel 25.

By way of the set-screw 3|, the holder 40 is locked fast to the member29, for rearward projection therefrom and through the slot 39 as alreadypointed out. The slot 39 is so proportioned, and so placed on the barrel25, relative .to the lengthof said barrel and to the length of themember 29, that with the latter at either of its extreme limits ofreciprocation the entirety of the bore through the barrel 25 is occupiedby some portion of the member 29.

Moreover, the provision on the barrel 25 of the slot 39 and also theaperture 30, makes it almost Rigidly upstanding from the main plate I9is a post 41 having therethrough a drilled and tapped hole near itsupper end for taking a feedscrew 49 shown as having a wing-typefingerpiece 49 at its outer end. The inner end of this screw bearsagainst the outer side of the barrel 25, with the post so located thatsuch bearing is at a point along the barrel about midway between itsends.

For normally urging the barrel 25 to a position suchthat the dressinginstrumentality 44 is retracted, a retractile spring 50 is connected atone end to a hook 5| secured to the post 41 and at its other end to ahook 52 carried by the connector 21.

The main plate [9 is provided with a pair of slots 53 and 54, wherebybolts or screws may be employed to secure the device on a suitablesupport, as, for example, on the flat guide, plate 55 of the grindingmachine shown in Fig. 1; this plate having two tapped holes 56 and 51,in placements agreeing with the locations .of the slots 53 and 54 on thesaid plate I9.

With the device thus mounted, say on the guide plate 55, the dressinginstrumentality 44 of the device will be workingly directed toward thegrinding wheel 58. By turning of the feedscrew '48, advancement of thebarrel 25, and

with it said instrumentality 44, is effected, for proper engagement ofsaid instrumentality with the wheel 58; and then, by swinging the handle38, said instrumentality 44 may be caused to traverse laterally theperiphery of the wheel 58. Back and forth swinging of said handle causesthe instrumentality 44 to sweep back and forth across the periphery ofthe wheel while it is in rotation. As the wheel dressing continues, thefeed-screw 48 is from time to time, as and if required, further turned.When the wheel dressing is completed, turning of the feed-screw in theopposite direction frees the spring 50 to retract the instrumentality 44to cause disengagement thereof from the wheel.

The new device, eliiciently and easily manually operative as above, isexceptionally compact, and while rugged throughout of very light weight.The only accumulations of dust and grit ever possibly to become a littletroublesome are under the gibs l5 and [6, in the aperture 39- and in theslot 39. By arranging the plate [9 substantially vertical with its side26 lowermost and tapping the device sharply against a fixed anvil or thelike, any accumulations of dust and grit under said gibs and in the saidslot are ejected. By turning the device upside down, so that theaperture 39 is lowermost, a similar tapping treatment of the deviceresults in any dust and grit accumulation in said aperture beingejected.

While I have illustrated and described the preferred embodiment of myinvention, it is to be understood that I do not limit myself to theprecise constructions herein disclosed and the right is reserved to allchanges and modifications coming within the scope of the invention asdefined in the appended claim.

Having thus described my invention, what I claim as new, and desire tosecure by United States Letters Patent is:

In a device for dressing a grinding wheel having an elongated base to bemounted adjacent the grinding wheel with its length extended at rightangles to the grinding wheel to be dressed and having a slide mountedthereon for movement toward and away from the wheel, an elongated barrelfixedly mounted on the slide parallel to the elongation of the base andformed with an elongated slot in its side, a cylindrical member slidablyextended through said barrel and formed intermediate of its ends with arecess aligned with said slot, means connected between the base and saidcylindrical member for manually sliding said cylindrical member axiallyin one direction and then in the other direction relative to saidbarrel, a dressing tool having an inner end portion passed slidablythrough said slot and into said recess so that dressing tool will movewith said cylindrical member, a set screw threaded through saidcylindrical member and abutting the inner end portion of said dressingtool retaining it in position on said cylindrical member, a, postextended from the base on the side of said cylindrical member oppositethe side from which said dressing tool extends, an adjustment screwthreaded through said post and abutting said cylindrical member to beturned relative to said post for moving the slide and said cylindricalmember away from the post, and a contraction spring connected betweensaid post and said slide in a direction in which said cylindrical memberis abutted against said adjustment screw.

MICHAEL HRANKOWSKI.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 512,653 Kling Jan. 9, 1894637,297 Strong Nov. 21, 1899 693,399 Jenkins Feb. 18, 1902 760,926Schroeder May 24,1904 981,810 Sterling Jan. 17, 1911 1,634,350 BriggsJuly 5, 1927 1,662,192 King Mar. 13, 1928 1,t94,705 Hall Dec. 11, 19282,452,398 Smith Oct, 26, 1948 y

